Pronunciation: (thrē'pēs'), [key]
1. Clothing.consisting of three matching or harmonious pieces, as an ensemble of coat, skirt, and blouse for a woman or a suit of a jacket, vest, and pair of trousers for a man.
2. having three parts.
a three-piece ensemble or suit. Cf. coordinate (def. 7).
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.